Inventories (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Inventory by Product Type [Abstract]
NGLs		$ 1,888.1	$ 1,094.9
Petrochemicals and refined products		642.6	311.5
Crude oil		758.1	674.2
Natural gas		14.7	10.8
Total		3,303.5	2,091.4
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]
Cost of sales	[1]	16,723.2	22,065.8	$ 26,789.8
Lower of cost or net realizable value adjustments recognized in cost of sales		$ 60.2	$ 22.7	$ 11.5

[1] Cost of sales is a component of “Operating costs and expenses,” as presented on our Statements of Consolidated Operations.  Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.